scholarly journals Analysis of the plasma transport in numerical simulations of helicon plasma thrusters

AIP Advances ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 115016
Author(s):  
N. Souhair ◽  
M. Magarotto ◽  
F. Ponti ◽  
D. Pavarin
Keyword(s):  
Numerical Simulations ◽  
Plasma Transport ◽  
Helicon Plasma ◽  
Plasma Thrusters

scholarly journals High-Density Helicon Plasma Thrusters Using Electrodeless Acceleration Schemes

2016 ◽  
Vol 14 (ists30) ◽  
pp. Pb_117-Pb_121 ◽  
Author(s):  
Daisuke KUWAHARA ◽  
Shunjiro SHINOHARA ◽  
Takamichi ISHII ◽  
Shuhei OTSUKA ◽  
Toshiki NAKAGAWA ◽  
...  
Keyword(s):  
High Density ◽  
Helicon Plasma ◽  
Plasma Thrusters

scholarly journals Global Modeling of N2O Discharges: Helicon Plasma Thruster Application

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Konstantinos Katsonis ◽  
Chloe Berenguer
Keyword(s):  
Electron Temperature ◽  
Electric Propulsion ◽  
Global Modeling ◽  
Helicon Plasma ◽  
Plasma Thruster ◽  
Plasma Thrusters ◽  
Averaged Model

A global (volume averaged) model pertaining to N2O discharges is used to design and to study electric propulsion applications, especially helicon plasma thrusters fed with pure N2O and also with N2/O2mixtures including air. Results obtained for N2O feeding are discussed and compared to those pertaining to an air-like N2/O2mixture feeding. An interesting similarity is observed. Comparison of the N2O model results versus those of Ar shows lower ionization percentage with higher electron temperature for N2O propellant.

Integrated Design Tools for RF Antennas for Helicon Plasma Thrusters

2014 ◽  
Author(s):  
Fabio Trezzolani ◽  
Antonio Selmo ◽  
Davide Melazzi ◽  
Vito Lancellotti ◽  
Marco Manente ◽  
...  
Keyword(s):  
Integrated Design ◽  
Design Tools ◽  
Helicon Plasma ◽  
Rf Antennas ◽  
Plasma Thrusters

Development of Electrodeless Plasma Thrusters With High-Density Helicon Plasma Sources

2014 ◽  
Vol 42 (5) ◽  
pp. 1245-1254 ◽  
Author(s):  
Shunjiro Shinohara ◽  
Hiroyuki Nishida ◽  
Takao Tanikawa ◽  
Tohru Hada ◽  
Ikkoh Funaki ◽  
...  
Keyword(s):  
High Density ◽  
Helicon Plasma ◽  
Plasma Sources ◽  
Plasma Thrusters

Saturation mechanism and generated viscosity in gravito-turbulent accretion disks

2020 ◽  
Vol 640 ◽  
pp. A53
Author(s):  
L. Löhnert ◽  
S. Krätschmer ◽  
A. G. Peeters
Keyword(s):  
Growth Rate ◽  
Numerical Simulations ◽  
Accretion Disks ◽  
Gravitational Instability ◽  
Turbulent Viscosity ◽  
Radial Distance ◽  
Maximum Growth ◽  
Wave Number ◽  
Radiative Cooling ◽  
Mixing Length

Here, we address the turbulent dynamics of the gravitational instability in accretion disks, retaining both radiative cooling and irradiation. Due to radiative cooling, the disk is unstable for all values of the Toomre parameter, and an accurate estimate of the maximum growth rate is derived analytically. A detailed study of the turbulent spectra shows a rapid decay with an azimuthal wave number stronger than ky−3, whereas the spectrum is more broad in the radial direction and shows a scaling in the range kx−3 to kx−2. The radial component of the radial velocity profile consists of a superposition of shocks of different heights, and is similar to that found in Burgers’ turbulence. Assuming saturation occurs through nonlinear wave steepening leading to shock formation, we developed a mixing-length model in which the typical length scale is related to the average radial distance between shocks. Furthermore, since the numerical simulations show that linear drive is necessary in order to sustain turbulence, we used the growth rate of the most unstable mode to estimate the typical timescale. The mixing-length model that was obtained agrees well with numerical simulations. The model gives an analytic expression for the turbulent viscosity as a function of the Toomre parameter and cooling time. It predicts that relevant values of α = 10−3 can be obtained in disks that have a Toomre parameter as high as Q ≈ 10.

Fabrication of Carbon Nanotube Triode Using Helicon Plasma Cvd with Electroplated Nico Catalyst

2003 ◽  
Vol 772 ◽  
Author(s):  
Masakazu Muroyama ◽  
Kazuto Kimura ◽  
Takao Yagi ◽  
Ichiro Saito
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Metal Catalyst ◽  
Ni Catalyst ◽  
Plasma Cvd ◽  
Helicon Plasma ◽  
Plasma Enhanced Cvd ◽  
Turn On ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned

AbstractA carbon nanotube triode using Helicon Plasma-enhanced CVD with electroplated NiCo catalyst has been successfully fabricated. Isolated NiCo based metal catalyst was deposited at the bottom of the cathode wells by electroplating methods to control the density of carbon nanotubes and also reduce the activation energy of its growth. Helicon Plasma-enhanced CVD (HPECVD) has been used to deposit nanotubes at 400°C. Vertically aligned carbon nanotubes were then grown selectively on the electroplated Ni catalyst. Field emission measurements were performed with a triode structure. At a cathode to anode gap of 1.1mm, the turn on voltage for the gate was 170V.

CHARACTERIZATION OF SPLASH-PLATE ATOMIZERS USING NUMERICAL SIMULATIONS

2007 ◽  
Vol 17 (4) ◽  
pp. 347-380 ◽  
Author(s):  
Mohammad P. Fard ◽  
Denise Levesque ◽  
Stuart Morrison ◽  
Nasser Ashgriz ◽  
J. Mostaghimi
Keyword(s):  
Numerical Simulations
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